The Startling Effect of Diet on the Brain

The Startling Effects of Diet on the Brain

More and more research is highlighting the strong connection between the gut and the brain. For many years we’ve heard of the damage that can be done to our bodies by high fat and high sugar diets. Now, there is startling evidence that the effects on our bodies are only part of the story, with diet also able to cause changes in the brain.

New research has found that a diet high in fat and sugar causes changes in the gut bacteria that seem to be related to a significant loss of cognitive flexibility, which is the power to adapt to change. The effect was strongest on a high sugar diet, which also impaired long and short-term memory.

The research was conducted on mice (because of their biological and physiological similarities to humans). After being fed different diets, they were given a variety of tests to explore the changes in their mental and physical function, as well as the changes in different types of gut bacteria.

After four weeks on a high fat or high sugar diet, there was a significant decline in the mental and physical function of the mice. One of the most profound changes was in cognitive flexibility.

Magnussen explained cognitive flexibility in this way, ‘Think about driving home on a route that’s very familiar to you, something you’re used to doing. Then one day that road is closed and you suddenly have to find a new way home.’

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Someone with a high level of cognitive flexibility would quickly adapt by finding another way home, and remembering to use that same route the next morning. Someone with diminished cognitive flexibility would struggle to adapt to the change, and would likely have a slow, stressful trip home.

The mice used in the study were younger ones, who would typically have a greater capacity to resist the impact of changes to their gut bacteria, or microbiota. In older humans or animals whose biological system might not be as healthy, the effect of high sugar and high fat on cognitive function might be even stronger.

‘It’s increasingly clear that our gut bacteria, or mictrobiota, can communicate with the human brain,’ reported Kathy Magnussen, a professor at Oregon State University.

 This study backs up an abundance of previous research that has demonstrated the influence of food on the brain, and gives us another good reason to taper down on fat and sugar.

5 Comments

Noelle

Very interesting … I’ve had an interest in holistic mental/physical health for some time. The theory of the gut as tied to other parts of a person’s health has really grabbed me.

However, I wonder about one part of this article: you mention that studies see high sugar and high fat as similarly destructive of overall health. I agree about sugar (that is, processed sugars). However, from what I’ve read, the common wariness about high fat comes from a faulty lumping-together of ALL kinds of fats into one category, rather than distinguishing different kinds. That is, there is a huge difference in the consumption of processed fats (typical of modern American diets) and the traditional consumption of unprocessed plant and animal fats. Take the French, for example, who seem to have a generous approach to natural fats and yet don’t suffer negative consequences from it. I’d love to see this research taking more of these sorts of distinctions into account, and see how it affects the outcomes.

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Carol

This is such poignant information for my family. Thank you so much! I’ve learned a lot through your posts on your site “Hey Sigmund”. This is practical and applicable advice !

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The move towards brave doesn’t have to be a leap. It can be a shuffle - lots of brave tiny steps, each one more brave than before. What’s important isn’t the size of the step but the direction.

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 #parentingteens #neurodevelopment #positiveparenting #neuronurtured #anxiety #anxietyinchildren
You know who I love? (Not counting every food delivery person who has delivered takeaway to my home. Or the person who puts the little slots in the sides of the soy sauce packets to make them easier to open. Not counting those people.) You know who? Adolescents. I just love them. 
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Today I spoke with two big groups of secondary school students about managing anxiety. In each talk, as there are in all of my talks with teens, there were questions. Big, open-hearted, thoughtful questions that go right to the heart of it all. 
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Some of the questions they asked were:
- What can I do to help my friend who is feeling big anxiety?
- What can I do to help an adult who has anxiety?
- How can I start the conversation about anxiety with my parents?

Our teens have big, beautiful, open hearts. They won’t always show us that, but they do. They want to be there for their friends and for the adults in their lives. They want to be able to come to us and talk about the things that matter, but sometimes they don’t know how to start. They want to step up and be there for their important people, including their parents, but sometimes they don’t know how. They want to be connected to us, but they don’t want to be controlled, or trapped in conversations that won’t end once they begin. 

Our teens need to know that the way to us is open. The more they can feel their important adults holding on to them - not controlling them - the better. Let them know you won’t cramp them, or intrude, or ask too many questions they don’t want you to ask. Let them know that when they want the conversation to stop, it will stop. But above all else, let them know you’re there. Tell them they don’t need to have all the words. They don’t need to have any words at all. Tell them that if they let you know they want to chat, you can handle anything that comes from there - even if it’s silence, or messy words, or big feelings - you can handle all of it. Our teens are extraordinary and they need us during adolescence more than ever, but this will have to be more on their terms for a while.  They love you and they need you. They won’t always show it, but I promise you, they do.♥️
Sometimes silence means 'I don't have anything to say.' Sometimes it means, 'I have plenty to say but I don't want to share it right here and right now.' We all need certain things to feel safe enough to put ourselves into the world. Kids with anxiety are thoughtful, observant and insightful, and their wisdom will always have the potential to add something important to the world for all of us.

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Rather than talking to them about what they can’t do (and they’ll probably want to talk about this a lot - that’s what anxiety does), ask them what they can do. It doesn’t matter how small the step is, as long as it’s forward.
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The idea is to gradually and gently expose them to the things that feel frightening. This is the only way to re-teach the amygdala that it’s safe. Let them know you understand it feels scary - they need to know you feel what they feel and that you get it. This will make your belief in them and your refusal to support avoidance more meaningful. Then move them towards brave.
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This can be tough. To move our children towards the things that are causing them distress pushes fiercely against our instincts as a parent - but - supporting avoidance, overprotecting, over-reassuring, the things we do that unintentionally accommodate anxiety over brave behaviour will only feed anxiety and make it more resistant to change. (And as a parent I’ve done all of these things at some time - we’re parents, not perfect, and parental love has a way of drawing us all in to unhelpful behaviours in the name of protecting our kiddos). .
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The point is, moving our children towards brave behaviour can feel awful, but it’s so important. When they focus on the fear and what they can’t do, try, ‘Okay, I know this feels scary. I really do. I also know you can do this. I understand this step feels too big, so what little step can you take towards it? What can you do that is braver than last time?’

 #parentingteens #neurodevelopment #positiveparenting #parenting #parenthood #neuronurtured #parentingtip #childdevelopment #braindevelopment #mindfulparenting #adolescence #positiveparentingtips #heyawesome #mentalhealth #heysigmund #motherhoodcommunity #parentingtips #anxiety #anxietysupport #anxietyrelief #parentingadvice #anxietyinchildren #heywarrior #childanxiety #anxietyawareness #mentalwellness
We can’t decide the lessons our children learn and we can’t decide when they learn them, but we can create the space that invites the discovery. We can do this by making it safe for them to speak, and to wander around their own experiences so the lessons and wisdom can emerge.
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